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https://git.dpkg.org/git/dpkg/debsig-verify.git
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6585cf0e02
This makes the code more portable, and means we can enable flags not supported by all compilers, such as gcc or clang specific ones. Partially import dpkg-compiler.m4 from dpkg, eventually either this package will be merged into dpkg proper, or libdpkg-dev will provide those m4 macros.
40 lines
1.3 KiB
Plaintext
40 lines
1.3 KiB
Plaintext
# Copyright © 2013-2016 Guillem Jover <guillem@debian.org>
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# DPKG_CHECK_COMPILER_FLAG
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# ------------------------
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AC_DEFUN([DPKG_CHECK_COMPILER_FLAG], [
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m4_define([dpkg_check_flag], m4_bpatsubst([$1], [^-Wno-], [-W]))
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AC_LANG_CASE(
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[C], [
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m4_define([dpkg_compiler], [$CC])
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m4_define([dpkg_varname], [CFLAGS])
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m4_define([dpkg_varname_save], [dpkg_save_CFLAGS])
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m4_define([dpkg_varname_export], [COMPILER_CFLAGS])
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AS_VAR_PUSHDEF([dpkg_varname_cache], [dpkg_cv_cflags_$1])
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],
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[C++], [
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m4_define([dpkg_compiler], [$CXX])
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m4_define([dpkg_varname], [CXXFLAGS])
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m4_define([dpkg_varname_save], [dpkg_save_CXXFLAGS])
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m4_define([dpkg_varname_export], [COMPILER_CXXFLAGS])
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AS_VAR_PUSHDEF([dpkg_varname_cache], [dpkg_cv_cxxflags_$1])
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])
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AC_CACHE_CHECK([whether ]dpkg_compiler[ accepts $1], [dpkg_varname_cache], [
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AS_VAR_COPY([dpkg_varname_save], [dpkg_varname])
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AS_VAR_SET([dpkg_varname], ["-Werror dpkg_check_flag"])
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AC_COMPILE_IFELSE([
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AC_LANG_SOURCE([[]])
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], [
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AS_VAR_SET([dpkg_varname_cache], [yes])
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], [
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AS_VAR_SET([dpkg_varname_cache], [no])
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])
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AS_VAR_COPY([dpkg_varname], [dpkg_varname_save])
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])
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AS_VAR_IF([dpkg_varname_cache], [yes], [
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AS_VAR_APPEND([dpkg_varname_export], [" $1"])
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])
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AS_VAR_POPDEF([dpkg_varname_cache])
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])
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